Fluid through cord

Elizabeth • Mommy of one beautiful girl, and twin boys (:
So my baby A, has a little more than average, amount of fluid going through the cord. Doctor said not to worry, but it's something they will watch. What could thatpossibly mean? With this twin also, one of his legs are shorter than average. They also might share a placenta. Doctor is supposed to call me when he figures it out. Baby B is measuring a little bit smaller tha A, which is normal. So that boy is doing good. I'm 19 weeks 3 days. I have another ultrasound in 5 weeks. I tried googling but it pops up with the amount of fluid around the baby. They told me it looked fine around the baby.